OPERATING INSTRUCTIONS AND DATA SHEET
FOR SAFETY CONTROLLER REA3
Safety switch REA3
,
Date:
17.08.2017
,
Page 8 of 12
Variotech GmbH, Gewerbeweg 5, 2230 Gänserndorf, Tel +43 2282 60310, http://variotech.com
Variotech GmbH, Gewerbeweg 5, 2230 Gänserndorf, Tel +43 2282 60310, http://variotech.com
Therefore, the monitoring of the reset button works in the following manner:
•
A blocked reset button is recognised immediately
•
The error is recorded
•
The “ON” LED goes out to indicate the error.
•
The safety switch does not deactivate and the lift travel can continue.
•
The safety switch deactivates on the next status change, with participation of the safety relay
(activate/deactivate current, magnetic switch error, relay error, voltage drop or overvoltage
detection, UCM error).
Supply voltage monitoring:
General information
:
The supply voltage must be 24V. A tolerance range of 1.5V above (25.5V) and
below (22.5V) is possible and does not have any limiting effect on function or reliability.
In case of higher voltage, however, the relay heats up, which should generally be avoided.
Most 24V mains adapters have the capability of adjusting the voltage in a range of +/- 10% with a
regulator. The correct voltage should be checked with a multimeter prior to commissioning.
The safety switch can be tested for correct operation of the activate and deactivate function by briefly
pressing the “Test button”.
Voltage drop recognition:
The safety switch tests the supply voltage on each activation and with each status change of the UCM
safety relay. If the supply voltage is less than 18V, the switch can no longer start.
Overvoltage recognition
:
The safety switch checks the supply voltage continuously. With a supply voltage of more than 27V, the
safety switch deactivates automatically.
If the voltage returns to the range of 24V, the safety switch re-activates.
Short-circuit protection on the output contacts of the safety relay:
Each of the outputs is protected with a fuse (2A flink).
In case of a short-circuit with 230VAC mains voltage at both outputs of the safety switch, the fuse
interrupts the current circuit.
In the process, none of the parts of the safety switch are damaged.
The safety switch operates again after replacement of the fuse.
